function selectPF(){
	if(pName=="ps"){
		document.getElementById("ps").style.display="none";
		document.getElementById("pf").style.display="block";
	}
	pName="pf";
}
function selectPS(){
	if(pName=="pf"){
		document.getElementById("pf").style.display="none";
		document.getElementById("ps").style.display="block";
	}
	pName="ps";
}